Unfortunately, the configuration of the additional extension strips is not implemented in this driver.
This device has a lot of custom, non-standard configurations and features. If you are using also other Aqara devices, it may be worth to consider purchasing one of their Zigbee to Matter hubs - the E1 is only 30 bucks, Then, you can use most of the Aqara devices in Hubitat fully locally, via the Matter Advanced Bridge. I have tested this Aqara LED Strip T1 and it works OK via the Matter bridge.
